There’s nothing unusual about a Tesla’s wiper fluid than anybody else’s. Many moons ago with Virginia bought wiper fluid dot caught out in Chicago where it was well below freezing, with salt and slush all over.
Auto parts places up that way very definitely sold the cold stuff. I’m not sure, but I seem to remember an ‘anti-freeze’ can of something-or-other that one could buy at auto parts stores that would take plain water and make it good to -20 or so.
The obvious thing to do, in your case, would to get an oil drain pan and a long, 1/4” piece of plastic tubing. Fill the reservoir in the car to the top with plain water and the tube likewise. Holding thumbs over both ends of the tube, plunge one end into the reservoir until it hits bottom, then put the other end into the oil drain pan or suitable receptive on the ground, and siphon all of it out of there.
Then put the cold weather stuff in there, clean the wipers a couple of times, and you should be good to go.
DO NOT suck on the end of the tube to start the siphon. That stuff is seriously poisonous. Dispose of the old stuff, I dunno, down a drain (it’s not oil) but not onto the street or an aquifer.
When the SO and I got stuck with seriously clogged wipers, I remember getting the good stuff and filling it up. But the stuff inside had to thaw first. We found a Sears Auto at a mall and very politely explained our predicament, loaded car (and a cat) and all, and asked if we could park for 30 minutes. After a dubious look, the guy agreed, it worked, and we were on our way.
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